Geophysical constraints on the crustal structure of the East European Platform margin and its foreland based on the POLCRUST-01 deep reflection seismic profile

Malinowski, M.; Guterch, A.; Narkiewicz, Marek; Petecki, Zdzisław; Janik, Tomasz; Środa, Piotr; Maksym, A.; Probulski, J.; Grad, M.; Czuba, Wojciech; Gaczyński, E.; Majdański, Mariusz; Jankowski, Leszek

doi:10.1016/j.tecto.2015.03.029

Cited by 19 publications

(16 citation statements)

References 45 publications

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“…The present study allows the discrimination between the three options mentioned above, supporting the latter possibility. Similar geometry of the crustal keel in the vicinity of the presumed TTZ was recently inferred from the joint interpretation of the deep refraction CEL05 profile [ Grad et al ., ] and POLCRUST‐01 deep‐reflection seismic profile [ Malinowski et al ., , ] located in SE Poland. However, our inferences cannot be fully extrapolated to the part of the TTZ extending beyond the Grójec Fault (Figure ) because the presence of suspect terranes in SE Poland may introduce additional complexity.…”

Section: Discussionmentioning

confidence: 99%

Is the Teisseyre‐Tornquist Zone an ancient plate boundary of Baltica?

et al. 2015

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The Teisseyre-Tornquist Zone (TTZ) is generally regarded as a fossil plate boundary in Europe that extends 2000 km from the Baltic Sea to the Black Sea. We used an integrated approach merging potential fields and seismic data to explore crustal architecture across the TTZ in central Poland. The aim of the study was to test whether the TTZ coincides with an early Paleozoic (Caledonian) suture formed through the closure of the Tornquist Ocean along the SW Baltica margin. The suture is presumed to separate the East European Craton (EEC) from the Paleozoic terranes of Western Europe. Two seismic reflection lines from the PolandSPAN ™ experiment were used to image the deep structure at the SW margin of the EEC. Lines PL-5300 and PL-5400 run NE-SW in central and northern Poland, respectively. The seismic interpretation down to top of basement was integrated with 2-D gravity and magnetic modeling to highlight the structure of the deep crust. Both the gravity and magnetic models show a suture that welds together two blocks at the base of crust. However, top of basement above the suture dips uniformly to the SW and is overlain by undisturbed lower Paleozoic and younger sediments. By implication, the suture must have developed in the Precambrian and both crustal blocks amalgamated belong to the EEC. Consequently, the Caledonian suture, formed by the closure of the Tornquist Ocean between Avalonia and Baltica, must be located farther southwest beneath thick upper Paleozoic and Mesozoic sediments.

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Section: Discussionmentioning

confidence: 99%

Is the Teisseyre‐Tornquist Zone an ancient plate boundary of Baltica?

et al. 2015

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“…In par tic u lar, the Tomaszów Fault (=TTZ in SE Poland), Izbica-Zamooeae Fault and Cieszanów Fault Zone (CFZ) are well-doc u mented in the up per sed i men tary layer (e.g., Kowalska et al, 2000;Krzywiec, 2009), and can be traced ver ti cally down to the base ment top and to deeper crustal dis con ti nu ities dis cern ible in seis mic re flec tivity pat terns . Malinowski et al (2015) in ves ti gated two al ter na tive variants of the Ma³opolska and £ysogóry blocks bound ary as suming ei ther its subvertical ori en ta tion (Malinowski et al, 2013;Narkiewicz et al, 2015) or in cli na tion at an an gle of ca. 40° to the SW.…”

Section: Basement Boundaries: Vertical or Inclined?mentioning

confidence: 99%

“…How ever, the grav ity-mag netic mod el ing re sults ap peared in con clu sive, sup port ing both subvertical fault and thrust vari ants. Malinowski et al (2015) reviewed avail able geo phys i cal and geo log i cal ev i dence, and accepted the first vari ant as the more prob a ble one. The main argu ments in cluded: (1) seis mic re frac tion and re flec tion ev idence of a more lim ited ex tent of the EEC crust bounded by the ver ti cal trace of the CFZ, (2) a deep ver ti cal con duc tive zone cor re spond ing to the Holy Cross Su ture as con strained by magnetotelluric soundings (Ernst et al, 2002; see also Semenov et al, 1998), (3) a lack of ev i dence of thrust ing in the subsurface Lower Pa leo zoic strata of the NE Ma³opolska Block mar gin, in ves ti gated in bore holes and shal low seis mic re flection pro files (Kowalska et al, 2000, Maksym et al, 2003Bu³a and Habryn, 2011).…”

Section: Basement Boundaries: Vertical or Inclined?mentioning

confidence: 99%

Basement structure of the Paleozoic Platform in Poland

Narkiewicz

Petecki

2017

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1 Pol ish Geo log i cal In sti tute -Na tional Re search In sti tute, Rakowiecka 4, 00-975 Warszawa, Po land Narkiewicz, M., Petecki, Z., 2017. Base ment struc ture of the Pa leo zoic Plat form in Po land. Geo log i cal Quar terly, 61 (2): 502-520, doi: 10.7306/gq.XXXX The Pa leo zoic Plat form com prises the south west ern half of the Pol ish ter ri tory, sep a rated from the Pre cam brian East Eu ropean Plat form (EEP) by a NW-SE trending subvertical lithospheric-scale dis con ti nu ity -the Teisseyre-Tornquist Zone. In the pres ent study, the Pa leo zoic Plat form base ment is sub di vided based on geo log i cal and geo phys i cal ev i dence ac quired dur ing the last de cades, in clud ing deep seis mic re frac tion and re flec tion re sults, as well as grav ity, mag netic and magnetotelluric data. The units ad ja cent to the EEP, the Mid-Pol ish Do main (com pris ing the £ysogóry Block) and the Pom era nian Block, are char ac ter ized by a thinned three-layer EEP-type crys tal line crust (age 1.7-3.7 Gy). Their old est plat form cover is prob a bly com posed of thick Ediacaran syn-rift sed i men tary and vol ca nic rocks. Their west ern ex ten sion in the contig u ous Ger man and Bal tic area can be traced as far as the East Elbian Mas sif and Thor Su ture based mainly on mag netic anom aly pat terns. The Up per Silesian and Ma³opolska blocks lo cated in SE Po land are char ac ter ized by Cadomian (660-600 My) base ment over lain by the thick de formed Ediacaran foredeep de pos its. Whereas the units with the EEP-type base ment are in ter preted as prox i mal ter ranes dis placed along the EEP mar gin dur ing the late Early Pa leo zoic, the blocks with a Cadomian base ment are con ceived as ex otic ter ranes of a pos si ble Gondwanan prov e nance. All these ter ranes were accreted ul ti mately dur ing the fi nal, lat est Si lu rian stages of the Cal edo nian de for ma tion al though the ex act sce nario of the amal gam ation re mains hy po thet i cal. The Sudetic Do main in SW Po land is a col lage of dif fer ent crustal units jux ta posed ul timately in the Penn syl va nian (ca. 310 Ma) dur ing the fi nal ep i sodes of the Variscan Orog eny. Their north ern bound ary cor responds to the Rheic Su ture trace able in mag netic and grav ity anom a lies pat tern along the north ern mar gin of the Wolsztyn-Leszno High, and con tin u ing west wards along the Mid-Ger man Crys tal line High. The ar cu ate trace of the su ture in the NE is dextrally dis placed along the Odra Fault, and con tin ues south wards where it is mapped as the Moravian-Silesian Su ture.

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“…In some interpretations (Jaworowski and Sikorska 2006;Mizerski 2004) the MB is interpreted as a part of the EEC Cambrian passive margin. Recent studies of Narkiewicz et al (2015) and Malinowski et al (2015), based on POLCRUST-01 data interpretation, suggest that the Łysogóry Block crust has characteristics typical for the EEC proximal terrane, while the Małopolska Block is clearly an exotic terrane of Vol. 174, (2017) Crustal seismic anisotropy of the Małopolska BlockGondwanan origin.…”

Section: Geologymentioning

confidence: 99%

Crustal Structure, Seismic Anisotropy and Deformations of the Ediacaran/Cambrian of the Małopolska Block in SE Poland Based on Data from Two Seismic Wide-Angle Experiments

Środa

2017

Pure Appl. Geophys.

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Abstract-The area of SE Poland represents a complex contact of tectonic units of different consolidation age-from the Precambrian East European Craton, through Palaeozoic West European Platform (including Małopolska Block) to Cenozoic Carpathians and Carpathian Foredeep. In order to investigate the anisotropic properties of the upper crust of the Małopolska Block and their relation to tectonic evolution of the area, two seismic datasets were used: seismic wide-angle off-line recordings from POLCRUST-01 deep seismic reflection profile and recordings from active deep seismic experiment CELEBRATION 2000. During acquisition of deep reflection seismic profile POLCRUST-01 in 2010, a 35-km-long line of 14 recorders (PA-14), oriented perpendicularly to the profile, was deployed to record the refractions from the upper crust (Pg) at wide range of azimuths. These data were used for an analysis of the azimuthal anisotropy of the MB with the modified delay-time inversion method. The results of modelling of the off-line refractions from the MB suggest *6% HTI anisotropy of the Cambrian/Ediacaran basement, with *1308 azimuth of the fast velocity axis and mean Vp of 4.9 km/s. To compare this result with previous, independent information about anisotropy at larger depth, a subset of previously modelled data from CELEBRATION 2000 experiment, recorded in the MB area, was also analysed by inversion. The recordings of Pg phase at up to 120 km offsets were analysed using anisotropic delay-time inversion, providing information down to *12 km depth. The CELEBRATION 2000 model shows *9% HTI anisotropy with *1268 orientation of the fast axis. Thus, local-scale anisotropy of this part of MB confirms the large-scale anisotropy suggested by previous studies based on data from a broader area and larger depth interval. The azimuthal anisotropy (i.e. HTI symmetry of the medium) is interpreted as a result of strong compressional deformation during the accretion of terranes to the EEC margin, leading to tight (sub-vertical) folding and fracturing of intrinsically anisotropic metasediments forming the MB basement. Obtained anisotropy models are compared with data about stratal dips of the MB sequences and implications of assuming more realistic TTI model are discussed. Wide-angle recordings from off-line measurements along a reflection profile provided new information about seismic velocity and anisotropy, not available from standard near-vertical profiling, and contributed to more complete image of the upper crustal structure of Małopolska Block.

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Geophysical constraints on the crustal structure of the East European Platform margin and its foreland based on the POLCRUST-01 deep reflection seismic profile

Cited by 19 publications

References 45 publications

Is the Teisseyre‐Tornquist Zone an ancient plate boundary of Baltica?

Is the Teisseyre‐Tornquist Zone an ancient plate boundary of Baltica?

Basement structure of the Paleozoic Platform in Poland

Crustal Structure, Seismic Anisotropy and Deformations of the Ediacaran/Cambrian of the Małopolska Block in SE Poland Based on Data from Two Seismic Wide-Angle Experiments

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